The Major Surprise About Cygnus A, One of the First

question 81

Multiple Choice

The major surprise about Cygnus A, one of the first three sources of strong radio emission detected by Grote Reber in the late 1930s, when examined with large optical telescopes, was that it

• A) had no corresponding optical counterpart at all.
• B) was at the center of the Milky Way Galaxy.
• C) was a very distant object that was relatively faint at optical wavelengths yet extremely luminous at radio wavelengths.
• D) was a very bright supernova remnant.

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Definitions:

Free-Radical Theory

A hypothesis suggesting that aging and its related diseases are the result of accumulated damage from free radicals, which are unstable molecules that can damage cells.

Aging

The process of becoming older, a physiological process that leads to the decline of biological functions and the ability to adapt to metabolic stress.

DNA Damage

Refers to changes in the chemical structure of DNA, which can result from environmental factors, such as UV light or radiation, and can lead to mutations if not repaired.

Sexual Maturation

This refers to the physical development stages during puberty in which an individual becomes capable of sexual reproduction.